Option in scala

Author: CodeLab20

4.Classes/Options.scala

@@ -0,0 +1,62 @@
+class Employee(val firstName:String, val midName:Option[String], val lastName:String){
+    def this(firstName:String, midName:String, lastName:String) = 
+        this(firstName, Some(midName), lastName)
+    
+    def this(firstName:String, lastName:String) = 
+        this(firstName, None, lastName)
+    
+    def this() = 
+        this("Unknown", "Unknown")
+}
+
+object Options extends App
+{
+    val midName = Some("Shahaji")
+    val midName2:Option[String] = midName
+    val midName3:Some[String] = midName
+    
+    val noMidName = None
+    val noMidName2:Option[String] = noMidName
+    val noMidName3:Option[Nothing] = noMidName
+    val noMidName4:None.type = noMidName
+    
+    val shivaji = new Employee("Shivaji", midName, "Bhosale")
+    val charlie = new Employee("Charlie", "Chaplin")
+    val stranger = new Employee()
+    
+    println(midName.getOrElse("No Middle Name"))
+    println(noMidName.getOrElse("No Middle Name"))
+    println("Shivaji Middle Name:" + shivaji.midName.getOrElse("No Middle Name"))
+    println("Charlie Middle Name:" + charlie.midName.getOrElse("No Middle Name"))
+    println("Stranger Middle Name:" + stranger.midName.getOrElse("No Middle Name"))
+    
+    def getMiddleName(x:Option[String]):String =
+    {
+        x match
+        {
+            case Some(name) => name
+            case None => "No Middle Name"
+        }
+    }
+    
+    println("Shivaji Middle Name using function:" +getMiddleName(shivaji.midName))
+    println("Shivaji Middle Name using function:" +getMiddleName(charlie.midName))
+    println("Shivaji Middle Name using function:" +(stranger.midName))
+}
+
+/**
+Sample Output
+
+> scalac Options.scala
+
+> scala Options
+Shahaji
+No Middle Name
+Shivaji Middle Name:Shahaji
+Charlie Middle Name:No Middle Name
+Stranger Middle Name:No Middle Name
+Shivaji Middle Name using function:Shahaji
+Shivaji Middle Name using function:No Middle Name
+Shivaji Middle Name using function:None
+
+**/